The only thing on google about hammers is the instructables with the explosive air realese and a little on a website where some one takes apart a crossman 2200. I personally am a huge fan of hammers they are cheep, easy to use and make and have a relatively high flow and require no pilot. I am only suggesting this solution so that new members can just look at a single page and see all valves we could even make some kind of rating system(flow, opening speed ect.). I am happy to help out, but not if i the only one...And let my finsihe my first gun first, i sound dumb when i comment on somehting and dont even have the practiacal experience.

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"Did you ever stop to think that out of the seven deadly sins envy is the only one which doesn't give the sinner even momentary pleasure"-George Will